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WOOL is a simple, powerful dialogue framework for creating virtual agent conversations.
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/*
 * Copyright 2019 Roessingh Research and Development.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a 
 * copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation 
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the 
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 * DEALINGS IN THE SOFTWARE.
 */

package nl.rrd.wool.json;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import nl.rrd.wool.exception.ParseException;

public class JsonMapper {

	/**
	 * Converts the specified JSON string to an object of the specified class
	 * using the Jackson {@link ObjectMapper ObjectMapper}.
	 * 
	 * @param json the JSON string
	 * @param clazz the result class
	 * @param  the type of object to return
	 * @return the result object
	 * @throws ParseException if a JSON parsing error occurs
	 */
	public static  T parse(String json, Class clazz)
			throws ParseException {
		ObjectMapper mapper = new ObjectMapper();
		try {
			return mapper.readValue(json, clazz);
		} catch (JsonParseException ex) {
			throw new ParseException("Can't parse JSON code: " +
					ex.getMessage(), ex);
		} catch (JsonMappingException ex) {
			throw new ParseException("Can't map JSON code to object: " +
					ex.getMessage(), ex);
		} catch (IOException ex) {
			throw new RuntimeException("I/O error when reading from string: " +
					ex.getMessage(), ex);
		}
	}

	/**
	 * Converts the specified JSON string to an object of the specified result
	 * type using the Jackson {@link ObjectMapper ObjectMapper}.
	 * 
	 * @param json the JSON string
	 * @param typeRef the result type
	 * @param  the type of object to return
	 * @return the result object
	 * @throws ParseException if a JSON parsing error occurs
	 */
	public static  T parse(String json, TypeReference typeRef)
			throws ParseException {
		ObjectMapper mapper = new ObjectMapper();
		try {
			return mapper.readValue(json, typeRef);
		} catch (JsonParseException ex) {
			throw new ParseException("Can't parse JSON code: " +
					ex.getMessage(), ex);
		} catch (JsonMappingException ex) {
			throw new ParseException("Can't map JSON code to object: " +
					ex.getMessage(), ex);
		} catch (IOException ex) {
			throw new RuntimeException("I/O error when reading from string: " +
					ex.getMessage(), ex);
		}
	}

	/**
	 * Converts the specified JSON object (the result of parsing JSON code to
	 * a basic Java type) to an object of the specified class using the Jackson
	 * {@link ObjectMapper ObjectMapper}.
	 *
	 * @param json the JSON object
	 * @param clazz the result class
	 * @param  the type of object to return
	 * @return the result object
	 * @throws ParseException if the JSON object can't be converted to the
	 * specified class
	 */
	public static  T convert(Object json, Class clazz)
			throws ParseException {
		ObjectMapper mapper = new ObjectMapper();
		try {
			return mapper.convertValue(json, clazz);
		} catch (IllegalArgumentException ex) {
			throw new ParseException("Can't map JSON code to object: " +
					ex.getMessage(), ex);
		}
	}

	/**
	 * Converts the specified JSON object (the result of parsing JSON code to
	 * a basic Java type) to an object of the specified result type using the
	 * Jackson {@link ObjectMapper ObjectMapper}.
	 *
	 * @param json the JSON object
	 * @param typeRef the result type
	 * @param  the type of object to return
	 * @return the result object
	 * @throws ParseException if the JSON object can't be converted to the
	 * specified type
	 */
	public static  T convert(Object json, TypeReference typeRef)
			throws ParseException {
		ObjectMapper mapper = new ObjectMapper();
		try {
			return mapper.convertValue(json, typeRef);
		} catch (IllegalArgumentException ex) {
			throw new ParseException("Can't map JSON code to object: " +
					ex.getMessage(), ex);
		}
	}

	/**
	 * Generates a JSON string from the specified object. If the object can't
	 * be converted to JSON, this method throws a {@link RuntimeException
	 * RuntimeException}.
	 *
	 * @param obj the object
	 * @return the JSON string
	 */
	public static String generate(Object obj) {
		ObjectMapper mapper = new ObjectMapper();
		try {
			return mapper.writeValueAsString(obj);
		} catch (JsonProcessingException ex) {
			throw new RuntimeException("Can't convert object to JSON: " +
					ex.getMessage(), ex);
		}
	}
}